diff --git "a/\346\242\205\346\242\246\347\224\234/\346\242\205\346\242\246\347\224\2340215/0215.js" "b/\346\242\205\346\242\246\347\224\234/\346\242\205\346\242\246\347\224\2340215/0215.js"
new file mode 100644
index 0000000000000000000000000000000000000000..ca326f02883c736d906ec63e6f9db90ae55eff58
--- /dev/null
+++ "b/\346\242\205\346\242\246\347\224\234/\346\242\205\346\242\246\347\224\2340215/0215.js"
@@ -0,0 +1,25 @@
+//作业：写个加减乘除的模块（尽量少写暴露,要考虑复用性），供外部使用. 作业每个分支要建一个目录（自己名字）
+  
+var num1;
+var num2;
+let obj={
+    change:function(num11,num22){
+        num1=num11
+        num2=num22;
+    },
+    jia:function(){
+        return num1+num2;
+    },
+    jian:function(){
+        return num1-num2
+    },
+    cheng:function(){
+        return num1*num2
+    },
+    chu:function(){
+        return num1/num2
+    }
+}
+module.exports.obj=obj;
+
+
diff --git "a/\346\242\205\346\242\246\347\224\234/\346\242\205\346\242\246\347\224\2340215/result.js" "b/\346\242\205\346\242\246\347\224\234/\346\242\205\346\242\246\347\224\2340215/result.js"
new file mode 100644
index 0000000000000000000000000000000000000000..be3d653597aaad5a06519afdbd027d1c40c2266a
--- /dev/null
+++ "b/\346\242\205\346\242\246\347\224\234/\346\242\205\346\242\246\347\224\2340215/result.js"
@@ -0,0 +1,7 @@
+let obj=require("./0215.js");
+obj.obj.change(5,5);
+console.log(obj.obj.jia());
+console.log(obj.obj.jian());
+console.log(obj.obj.cheng());
+console.log(obj.obj.chu());
+